package com.lch.webdemo.util;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

/**
 * Created by yangli on 16/11/16.
 */
@Component
public class SpringUtil implements ApplicationContextAware {

    private static ApplicationContext applicationContext = null;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {

        if (SpringUtil.applicationContext == null) {

            SpringUtil.applicationContext = applicationContext;

        }
    }


    //获取applicationContext

    public static ApplicationContext getApplicationContext() {

        return applicationContext;

    }


    //通过name获取 Bean.

    public static Object getBean(String name) {

        return getApplicationContext().getBean(name);

    }


    //通过class获取Bean.

    public static <T> T getBean(Class<T> clazz) {

        return getApplicationContext().getBean(clazz);

    }


    //通过name,以及Clazz返回指定的Bean

    public static <T> T getBean(String name, Class<T> clazz) {

        return getApplicationContext().getBean(name, clazz);

    }
}
